1. Recent Articles From Around The Web

    1. Image contrast correction method in full-field optical coherence tomography

      Image contrast correction method in full-field optical coherence tomography

      An image contrast correction method is proposed for en face images obtained with full-field optical coherence tomography (FFOCT). First, the mechanism of image contrast decrease in FFOCT is considered and the theoretical models of main parameters that degrade image contrast are analyzed. Second, changes of contrast with depth are calculated under various conditions, from which the main parameters that affect contrast in tissue are identified. Then based on the analysis, the methods are proposed for correcting image contrast. Finally, the en face tomographic images of human liver tissue at different depths with and without contrast correction are presented to demonstrate ...

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    2. Evaluation of posterior vitreous detachment using ultrasonography and optical coherence tomography

      Evaluation of posterior vitreous detachment using ultrasonography and optical coherence tomography

      Purpose To compare the diagnostic ability of ultrasonography (US) and optical coherence tomography (OCT) in evaluating posterior vitreous detachment (PVD) status. Methods In total, 124 eyes in 63 patients were prospectively enrolled. Posterior vitreous detachment (PVD) status was evaluated by two examiners independently using US and OCT (transverse scan with/without peripapillary scan). By combining all examination results from both examiners, a final agreement on the PVD status was made. Inter‐observer agreement and inter‐examination agreement on PVD detection were evaluated. Results The inter‐observer agreement on PVD grading based on US was substantial (kappa = 0.628). The inter ...

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    3. Optical coherence tomography angiography characteristics of acute retinal arterial occlusion

      Optical coherence tomography angiography characteristics of acute retinal arterial occlusion

      Background To characterize the vascular changes in eyes within the acute phase of retinal arterial occlusion (RAO) by optical coherence tomography angiography (OCT-A) imaging. Methods This was a retrospective, observational study. Nineteen patients with RAO (symptom onset within 7 days) and 19 age and sex-matched normal control individuals were included. A comprehensive ophthalmic examination and OCT-A examination were conducted for all the patients. Results The vessel density of the superficial capillary plexus (SCP), deep capillary plexus (DCP), and area with a width of 300 μm around the FAZ (FD-300) was significantly reduced in RAO patients compared with that in the ...

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      Mentions: Jing Xu
    4. Computed Tomography–Mediated Registration of Trapeziometacarpal Articular Cartilage Using Intraarticular Optical Coherence Tomography and Cryomicrotome Imaging: A Cadaver Study

      Computed Tomography–Mediated Registration of Trapeziometacarpal Articular Cartilage Using Intraarticular Optical Coherence Tomography and Cryomicrotome Imaging: A Cadaver Study

      Objective Accurate, high-resolution imaging of articular cartilage thickness is an important clinical challenge in patients with osteoarthritis, especially in small joints. In this study, computed tomography (CT) mediated catheter-based optical coherence tomography (OCT) was utilized to create a digital reconstruction of the articular surface of the trapeziometacarpal (TMC) joint and to assess cartilage thickness in comparison to cryomicrotome data. Design Using needle-based introduction of the OCT probe, the articular surface of the TMC joint of 5 cadaver wrists was scanned in different probe positions with matching CT scans to record the intraarticular probe trajectory. Subsequently and based on the acquired ...

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    5. Successful Treatment of Genital Warts with Ingenol Mebutate Monitored with Optical Coherence Tomography and Reflectance Confocal Microscopy

      Successful Treatment of Genital Warts with Ingenol Mebutate Monitored with Optical Coherence Tomography and Reflectance Confocal Microscopy

      Ingenol mebutate (IM) is approved for the treatment of actinic keratosis and induces cell death in precancerous lesions. The efficacy of IM in the treatment of genital warts was investigated in a therapy-refractory patient. The 74-year-old male was treated with IM gel for three consecutive days. Treatment course and efficacy were evaluated by clinical inspection and non-invasive diagnostics namely optical coherence tomography (OCT) and reflectance confocal microscopy (RCM). Within 24 to 48 hours IM induced a strong local inflammatory reaction. One week later a complete response was observed. OCT and RCM showed a strong reaction after treatment with erosions, swelling ...

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    6. Comparison of peripapillary and subfoveal choroidal thickness in normal versus primary open-angle glaucoma (POAG) subjects using spectral domain optical coherence tomography (SD-OCT) and swept source optical coherence tomography (SS-OCT)

      Comparison of peripapillary and subfoveal choroidal thickness in normal versus primary open-angle glaucoma (POAG) subjects using spectral domain optical coherence tomography (SD-OCT) and swept source optical coherence tomography (SS-OCT)

      Objective To elucidate the difference between choroidal thickness (CT) in primary open-angle glaucoma (POAG) and normal subjects and to compare the CT measured using spectral domain optical coherence tomography (SD-OCT) and swept source optical coherence tomography (SS-OCT). Methods and analysis This cross-sectional observational study included 25 eyes of 17 POAG subjects (cases) and 31 eyes of 20 normal subjects (controls). All the patients underwent complete ophthalmologic examination, enhanced depth imaging, SD-OCT and SS-OCT. In both controls and cases, the CT was measured in seven predetermined points in macular and peripapillary area and were compared. Results Choroid was significantly thicker on ...

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    7. Methods for Quantifying Optic Disc Volume and Peripapillary Deflection Volume Using Radial Optical Coherence Tomography Scans and Association with Intracranial Pressure

      Methods for Quantifying Optic Disc Volume and Peripapillary Deflection Volume Using Radial Optical Coherence Tomography Scans and Association with Intracranial Pressure

      Purpose: Papilledema and peripapillary deformation of Bruch’s membrane(BM) are associated with elevated intracranial pressure(ICP). We have developed a novel methodology to measure these parameters using a radial optical coherence tomography(OCT) scan pattern and apply this to test the hypothesis that ICP is associated with volumetric features of ophthalmic structures. Methods: 6-radial OCT B-scans centered over the optic nerve head were acquired in 17 subjects(30 eyes) before lumbar puncture with measurement of ICP(range:10-55 cm H2O). Internal limiting membrane(ILM) and BM were segmented. Three definitions of BM were studied to account for imaging artifact ...

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    8. Disease classification of macular Optical Coherence Tomography scans using deep learning software: validation on independent, multi-centre data

      Disease classification of macular Optical Coherence Tomography scans using deep learning software: validation on independent, multi-centre data

      Purpose: To evaluate Pegasus-OCT, a clinical decision support software for the identification of features of retinal disease from macula OCT scans, across heterogenous populations involving varying patient demographics, device manufacturers, acquisition sites and operators. Methods: 5,588 normal and anomalous macular OCT volumes (162,721 B-scans), acquired at independent centres in five countries, were processed using the software. Results were evaluated against ground truth provided by the dataset owners. Results: Pegasus-OCT performed with AUROCs of at least 98% for all datasets in the detection of general macular anomalies. For scans of sufficient quality, the AUROCs for general AMD and DME ...

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    9. Optical coherence tomography-based patient-specific coronary artery reconstruction and fluid–structure interaction simulation

      Optical coherence tomography-based patient-specific coronary artery reconstruction and fluid–structure interaction simulation

      Plaque rupture is related to the mechanical stress it suffered. The value and distribution of the mechanical stress in plaque could help on assessing plaque vulnerability. To look into the stress conditions in the coronary artery, a patient-specific coronary model was created by using optical coherence tomography (OCT) and angiography imaging data. The reconstructed coronary model consisted of the structure of the lumen, the arterial wall and plaque components. Benefited by the high resolution of OCT, detailed structures such as the thin fibrous cap could be observed and built into the geometry. On this reconstructed coronary model, a fully coupled ...

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    10. Optical coherence tomography of the retina, nerve fiber layer, and optic nerve head in dogs with glaucoma

      Optical coherence tomography of the retina, nerve fiber layer, and optic nerve head in dogs with glaucoma

      Objective To evaluate the retina and optic nerve head (ONH) in canine eyes predisposed to glaucoma using optical coherence tomography (OCT). Animals Twenty‐five eyes (24 dogs). Methods Measures of peripapillary retinal, retinal nerve fiber layer (RNFL), and ganglion cell complex (GCC) thickness and ONH parameters were obtained in vivo by OCT of the unaffected eye in dogs diagnosed with unilateral primary glaucoma (predisposed; n = 12) and compared with measures of healthy control eyes (normal; n = 13). Repeatability and intrarater reliability were explored using intraclass correlation coefficients (ICC). Results Compared to normal eyes, predisposed eyes had a thinner retina in ...

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    11. MGH Receives NIH Grant for Quantitative Biomechanics Imaging

      MGH Receives NIH Grant for Quantitative Biomechanics Imaging

      Massachusetts General Hospital Receives a 2019 NIH Grant for $340,916 for Quantitative Biomechanics Imaging. The principal investigator is Seok-Hyun Andy Yun. The program began in 2019 and ends in 2020. Below is a summary of the proposed work. TRD 1 The proposed research in TRD Project 1 is to develop novel optical coherence tomography (OCT)-based techniques and tools for measuring the mechanical properties and parameters as well as acoustic transduction in tissues. The focus on tissue biomechanics responds to the emerging opportunity to harness OCT's unique capabilities to obtain quantitative maps of tissue vibration, deformation, strain, and ...

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    12. MGH Receives NIH Grant for: Percutaneous and Interstitial Imaging

      MGH Receives NIH Grant for: Percutaneous and Interstitial Imaging

      Massachusetts General Hospital Receives a 2019 NIH Grant for $317,085 for TRD23: Percutaneous and Interstitial Imaging. The principal investigator is Martin Villiger. The program began in 2019 and ends in 2020. Below is a summary of the proposed work. TRD 3 The overall goal of TRD 3 is to enable advanced OCT imaging, with high resolution and functional and dynamic contrast, inside the living body, through narrow diameter, rotational probes. Instruments and algorithms will be developed that overcome fundamental barriers, intrinsic to flexible, rotational fiber-optic probes, that have previously compromised image quality and prohibited the integration of functional and ...

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    13. MGH Receives NIH Grant for TRD: Functional Imaging

      MGH Receives  NIH Grant  for TRD: Functional Imaging

      Massachusetts General Hospital Receives a 2019 NIH Grant for $338,551 for TRD: Functional Imaging. The principal investigator is Benjamin Vakoc. The program began in 2019 and ends in 2021. Below is a summary of the proposed work. TRD 2 TRD project 2 will develop novel optical coherence tomography (OCT) technologies to address unmet needs in the functional imaging of tissue. Specific Aim #1 addresses the need for high-speed and high- resolution angiographic imaging systems for preclinical research. A new high-speed optical architecture for high-resolution optical coherence microscopy (OCM) will be constructed that is 100 times faster than existing OCM ...

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    14. MGH Receives NIH Grant for the Center for Biomedical OCT Research and Translation

      MGH Receives  NIH Grant for the Center for Biomedical OCT Research and Translation

      Massachusetts General Hospital Receives a 2019 NIH Grant for $749,999 for the Center for Biomedical OCT Research and Translation. The principal investigator is Brett Bouma. The program began in 2011 and ends in 2021. Below is a summary of the proposed work. Overall the Center for Biomedical OCT Research and Translation seeks to push the technological frontier of optical coherence tomography instrumentation and methods in response to challenges in biology and medicine. Fundamental to our approach, CBORT thrives on an intimate, push-pull relationship between physicists/engineers and biological, pre-clinical and clinical scientists. The most direct impact o the Resource ...

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    15. UIUC Receives NIH Grant for Integration of Raman Spectroscopy and OCT for In-vivo identification of Bacterial Otitis Media

      UIUC Receives NIH Grant for Integration of Raman Spectroscopy and OCT  for In-vivo identification of Bacterial Otitis Media

      University of Illinois at Urbana Champaign Receives a 2019 NIH Grant for $648,154 for Integration of Raman Spectroscopy and Optical Coherence Tomography (RS-OCT) for In-vivo identification of Bacterial Otitis Media. The principal investigator is Stephen Boppart. The program began in 2019 and ends in 2023. Below is a summary of the proposed work. Otitis media (middle ear infection) is a highly prevalent disease, especially in young children. It has been documented that more than 75% of children will have at least one episode of otitis media (OM) by age 3, and many children will have recurrent or chronic OM ...

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    1. (4 articles) Massachusetts General Hospital
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    1. (3 articles) Carl Zeiss Meditec
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  5. Picture Gallery

    ZEISS Marks Milestone for its New North America High Tech Site in Dublin, California Using Optical Coherence Tomography to Make Needle Biopsies Safer Identification of Retinal Biomarkers in Alzheimer’s Disease Using Optical Coherence Tomography: Recent Insights, Challenges, and Opportunities Senior Scientist on Topcon Milpitas California International Ocular Circulation Society Inaugural Meeting, August 10, 2019 Portland Oregon ZEISS Ophthalmic Digital Summit 2019 Bacterial Density and Biofilm Structure Determined by Optical Coherence Tomography Handheld spectrally encoded coherence tomography and reflectometry for motion-corrected ophthalmic optical coherence tomography and optical coherence tomography angiography Laser cleaning of paintings: in situ optimization of operative parameters through non-invasive assessment by optical coherence tomography (OCT), reflection FT-IR spectroscopy and laser induced fluorescence spectroscopy (LIF) Spatiotemporal Tracking of Brain-Tumor-Associated Myeloid Cells in Vivo through Optical Coherence Tomography with Plasmonic Labeling and Speckle Modulation Image contrast correction method in full-field optical coherence tomography Evaluation of posterior vitreous detachment using ultrasonography and optical coherence tomography
  6. Recent Quotes

    1. Imaging is more accurate, helps guide decisions and facilitates tailored therapy, especially in younger heart attack patients who more frequently have plaque erosion or non-atherosclerotic coronary artery disease.
      By Giulio Guagliumi
    2. We are very pleased with the outcomes of this study, which are the culmination of hard work by 47 physicians across 18 collaborating hospitals...What is further encouraging is that this study was undertaken without key technological improvements that have since been launched commercially. We anticipate that future studies using the Real-time Targeting laser marking feature and our newly launched artificial intelligence software, Intelligent Real-time Image Segmentation, will improve upon these already very positive results. Working together with our commercial partner, Merit Medical, and many of the leading hospitals in the United States, we are ecstatic that this technology continues to have an important and beneficial impact for patients.
      By Eman Namati
    3. We can’t use functional OCT/OCTA in the brain to look at neurovascular coupling at the cellular level because the brain is surrounded by the skull, and fine resolution isn’t possible...But we can use functional OCT/OCTA to examine the interactions between individual photoreceptors and their blood vessels in the retina, which is much more accessible in the eye.
      By Xincheng Yao
    4. With the NSTIN plot, the temporal quadrant of the retinal nerve fiber layer is displayed in the center of the B-scan. This portion of the disc is crucial for everyday visual function, and identification of abnormal thinning in this region is essential for managing glaucoma.
      By Donald C. Hood
    5. Conavi is delighted to receive approval for the clinical use of the Novasight Hybrid System in Canada and are thankful to the many researchers, clinicians, patients, employees and other stakeholders that made this milestone possible.
      By Brian K. Courtney
    6. Being named a Fellow is a great honor, and I am in very illustrious company.
      By Audrey K. Bowden
    7. We are very excited and honored to partner with the team at Adachi. Adachi’s strong market presence in Otolaryngology, as well as their expertise in navigating Japanese regulatory and reimbursement pathways, will ensure a powerful launch of the TOMi Scope in the Japanese marketplace. We see this partnership as further validation of our technology and its potential to impact healthcare in a meaningful way. We look forward to a long and fruitful relationship with Adachi.
      By Ryan L. Shelton
    8. You can see right into the tooth,” said Dr. Daniel Fried, professor, University of California, San Francisco School of Dentistry. “The enamel looks almost like an ice cube...Many lesions in the mouth have been re-mineralized and...no longer need inter­vention,” said Fried. “Dentists have trouble telling the difference between active and arrested lesions; this new technology has the potential of differentiating them.
      By Daniel S. Fried
    9. OCT [already] has changed the practice of ophthalmol­ogy...It’s been very successful for retinal imaging...and it’s also very promising for dentistry...If the dentist doesn’t know if [a lesion] is active or arrested,” said Fried, “with OCT, you can actually see the lesion struc­ture, how deep it is and if it has a definitive surface zone suggesting that remineralization has occurred.
      By Daniel S. Fried
    10. This is the largest meeting in the world for biomedical optics, and that's because of you!
      By Rox Anderson